just purchased a 2018 seneca 37FS, 6.7 ISB
we wanted a bigger rig since we are living in it for now,
we sold our homes and the property we were looking at fell through, so we decided to wait and see what happens and travel for a while,
I might be asking a few questions, since I have owned a diesel before but was quite a few years ago, much has changed, like the new oils, and DEF, will be looking at what oils most use, and what not to use,
looking forward to glean for all the info here,

just purchased a 2018 seneca 37FS, 6.7 ISB
we wanted a bigger rig since we are living in it for now,
we sold our homes and the property we were looking at fell through, so we decided to wait and see what happens and travel for a while,
I might be asking a few questions, since I have owned a diesel before but was quite a few years ago, much has changed, like the new oils, and DEF, will be looking at what oils most use, and what not to use,
looking forward to glean for all the info here,

Welcome to Jayco Owners, we are glad you joined us.

When you have the time, completing a signature with the year make and model for your RV can help others to help you if and when you need it. And you can do that here;

DEF is pretty much standard across brands. The biggest concern is making sure you are getting fresh clean product. Truck stop pump DEF is popular as well as 2.5 Gal boxes from the auto parts store. I personally use Peak Blue DEF in my Sprinter. But again freshness is more of a concern than brand since DEF does have a shelf life.

As far as oil is concerned, the new diesel oils on the market are going to be CK-4 rated, surpassing the old CJ-4 or CI-4 formulations. All of your major brand are already switched over to CK. Avoid any old CI-4 only designed oils intended for older pre-emissions diesels. They could potentially do harm to your after treatment systems (DPF).